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Improvements

Asset Bundles: Introduced the ability to use ShaderVariantCollection to ensure Shader variants are built when packing the Shader with ShaderVariantCollection seperate from the Material using the Shader.

(764734) - Shadows: Fixed a memory leak and assert when shadows were cast from lights with specific properties and in a specific scene setup.

(855646) - UnityWebRequest: Fixed a high CPU usage issue when a request was continuing execution after exiting playmode.

(861468) - VCS: Don't attempt to connect to a Perforce server if any of the following parameters are unset: Server, User or Client.

(none) - VR: Fixed usage of VRSettings.renderViewportScale in Camera's OnPreCull so that it was not a frame latent on all supporting SDKs. Fixed issues with Valve's Renderer adaptive quality feature.

(none) - WebGL: Fixed Content-Length header field for local web server response that caused some audio files to have a duration of infinity or zero. This required an asset store plugin for webgl audio streaming and was not reproducible using other web servers.

(836947) - Graphics: Fixed a rendering bug when grab pass was used with forward rendering and graphics jobs are enabled.

(none) - IL2CPP: Emit proper C++ for unsafe methods that cast a void pointer to a type pointer and access a field from that type.

(851793) - IL2CPP: Fixed a runtime crash when trying to call interface methods on integral pointers in unsafe contexts. Issues seemed to only show up when code was built outside of Unity with the Microsoft .NET compiler.

(856410) - IL2CPP: Prevent a stack overflow in the player runtime when metadata for an infinitely nested recursive generic type used (like the FullName of that type).